Compare AquaTop EX digital aquarium heaters

Three wattages, three body lengths

The EX-100 is a 100 W model with a listed 7-inch height and a 25-US-gallon upper rating. The EX-200 is 200 W, 10 inches high and rated up to 50 gallons. The EX-300 is 300 W with a 12-inch body. Its maximum needs more care: the current product-page title and family card say 75 gallons, while the product page’s specification block and AquaTop’s older manual and datasheet say 80. The evidence does not show a model revision that resolves the conflict, so this edition screens the EX-300 at 75 gallons rather than silently using the larger figure.

Each current exact page identifies a separate EX SKU, lists 110–120 V / 60 Hz, describes a fully submersible in-tank heater for fresh and salt water, and gives an adjustable 68–93°F temperature range. The family adds an external digital touch controller and an LCD. AquaTop’s manual says the LCD shows actual aquarium water temperature after setting; no numeric accuracy tolerance is documented, so check a separate thermometer. None of the three is documented as having a shatterproof body.

• Read the individual EX-100 assessment for the 100 W, 7-inch configuration and its 25-gallon ceiling.
• Read the individual EX-200 assessment for the 200 W, 10-inch configuration and its 50-gallon ceiling.
• Read the individual EX-300 assessment for the 300 W, 12-inch configuration and the preserved 75/80-gallon conflict.

Plan the waterline and controller separately

The one-page AquaTop EX manual illustrates the heater element in the aquarium with the external controller above the water. It requires the water to remain at or above the minimum line marked on the heater and directs users to create a drip loop. The diagram is not a numeric water-depth specification, and the product-page height alone does not guarantee clearance in a specific tank. Check the actual waterline, the labeled minimum, space above the rim and the route for the controller and cable.

The manual also says to unplug before aquarium maintenance and allow the heater to cool for 10–15 minutes before removal. The exact manual and manufacturer page should accompany the item you buy; no cross-family instructions should replace them. The 110–120 V / 60 Hz claim comes from the manufacturer listing, not a physical unit inspection, so confirm the supplied label.

Put multiple requirements together

For the documented EX family, the useful buying interaction is tank volume plus water type, installation route and adjustable control: the EX-100, EX-200 and EX-300 are distinct in-tank options with conservative ceilings of 25, 50 and 75 US gallons, while all three share documented freshwater/saltwater use and an adjustable 68–93°F range.

These finder links keep the stated conditions together. They are not a compatibility guarantee; the exact model page, waterline mark and supplied manual still control setup.

• Saltwater, 25 gallons, in-tank, adjustable control and a 78°F setting
• The same needs at 26 gallons, beyond the EX-100 ceiling
• Freshwater at the EX-300 conservative ceiling when documented shatterproof protection is also essential
• Freshwater at 6 gallons when adjustable control and documented shatterproof construction are both essential

No model in this reviewed library satisfies freshwater use, a 6-gallon volume, fully submerged in-tank installation, adjustable control covering 78°F, and a documented shatterproof body at the same time; this empty result describes this evidence-bounded matcher, not every product on the market.

These links isolate the shared EX characteristics from model boundaries. The individual EX-100, EX-200 and EX-300 reviews discuss their different wattages, heights and capacity limits; a maximum-only match does not establish a minimum tank volume or heating performance.

Use the conservative capacity boundaries

At 25 gallons all three EX sizes meet their upper-capacity screens; at 26 gallons the EX-100 no longer does. At 50 gallons the EX-200 remains within its limit, while 51 gallons is outside; the EX-300 remains within its conservative 75-gallon screen through 75 gallons but not at 76. A tank-size maximum is not a lower-volume recommendation or a promise of heating performance in every room.

Freshwater, in-tank, adjustable at 78°F: 25 gallons · Same conditions at 26 gallons · Same conditions at 50 gallons · Same conditions at 51 gallons · Same conditions at 75 gallons · Same conditions at 76 gallons

For these six EX-specific boundary checks, freshwater use, in-tank installation, adjustable control and a 78°F setting stay constant while the 25/26-, 50/51- and conservative 75/76-gallon thresholds change. Read the separate EX-100, EX-200 and EX-300 reviews; beyond the EX-300 screen, the reviewed Fluval M300 is one example of a different capacity record, not proof of a universal fit.

Check the adjustable range at its endpoints

For the AquaTop EX digital heater in this same saltwater, 25-gallon, in-tank setup, 68°F and 93°F are included setting endpoints; 67°F and 94°F are outside the documented 68–93°F range. This is a control-range check, not a recommendation for an animal's water temperature or a claim of display accuracy.

• Same aquarium and setup at 67°F, below the EX lower endpoint
• The same conditions at the 68°F lower endpoint
• The same conditions at the 93°F upper endpoint
• The same conditions at 94°F, above the EX range

At 67°F, compare the separate analog EHEIM Jäger 100 W assessment; at 68°F and 93°F, the exact EX-100 control range includes the requested setting. No reviewed model matches this 25-gallon saltwater/in-tank/adjustable scenario at 94°F: the EX upper endpoint is 93°F, and the empty result is limited to the current reviewed library rather than every possible heater.